Critical thinking skills are one of the main competencies to be achieved in learning. Critical thinking skills can be taught through various methods, such as integrating through student worksheets (LKPD). Observations on the use of LKPD conducted at SMA Negeri 1 Parepare showed that the LKPD used did not support the development of students' critical thinking skills. In this regard, it is necessary to develop worksheets based on critical thinking skills. This study aims to produce worksheets that integrate critical thinking skills. This type of research is research and development (R&D) by adapting the learning development model from Thiagarajan known as 4-D namely defining, designing, developing, and disseminating. However, the development results in this study are only at the develop stage, namely only producing student worksheets based on critical thinking skills. Based on the results of the validation analysis obtained the average value of the total validation is 1, with a valid interpretation. The results of the teacher's questionnaire analysis obtained a total average value of 96% with very practical interpretations and student questionnaire analysis obtained a score of 85.11% with very practical interpretations. Thus a based LKPD has been producedSkills think critically on the basic competencies of environmental change and waste recycling for class X SMA that are valid, feasible and practical. LKPD development based on critical thinking skills is recommended to continue to be developed on other basic competencies so that students are trained to use their critical thinking skills.